Sectional boiler



(No Model.)

D. RENSHAW.

SBGTIONAL BOILBR.

Patented Ma,1.27,'1883.

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UNITED 'STATES PATENT OFFICE.

DAVID RENSHAVV, OF BOSTON, MASSACHUSETTS.

sEcTioNAi. B oiLER.

SPECIFICATIONorming part of Letters PatentNo. 274,825, dated March 2'?, 1883. Application filed October 12, 1882.` (No model.)

To all whom t may concern:

Be it known that I, DAVID RENSHAW, ofv

Boston, in the county of Suffolk and State of lllassachusetts, have invented certain new and .as sectional,boilers/and has for its object cheapness infirst cost, durability and security from explosions, easily manipulated, and sirnple in construction.

The invention consistsin providing individual sections of a sectional boiler with an upper large Water and steam portion and a lower smaller water portion continuous at their ends, and connected centrally by frusto conical tubes of the Galloway boiler type, and with connecting-Hanges all cast in one piece.

The boiler may be enlarged or diminished in size by increasing or diminishing the number of sections, each section being interchangeable.

Referring to the accompanying sheet of drawings, Figure 1 is a side elevation, partly in section. Fig. 2 represents an end sectional `view taken on the'line m rv ot' Fig. l.

A is the brick structure or boiler-setting, having hollow walls. B is the furnace, and C the grate-bars. On the side walls ot' the furnace, near their top, I form olsets or ledges c, forthe purpose of suspending the boiler over the furnace. Upon the ends ot' each boiler4 section l cast or otherwise provide lugs b, adapted to rest upon the ledges a of the wall A of the furnace, by means of which each sec, tion is suspended and held in place. As many ot' these sections as are required to make up the boiler may be suspended by the lugs b on the ledge a. The sections may beinterchan ged `with each other as occasion `may require, when from any cause they may become worn, overheated, or other cause requiring a change, and it would be advantageous to do it, and, with other boilers of its class, it has the advantage ot' being shipped in sections.

Referring more particularly to the construe tion of the boiler, D is the lower'or smaller portion, and E thel upper and larger steam and water portion. Connecting these portions D and E are frusto-conical tubes F, largely tapering for their length. l

The principle of my boiler is this, that the small quantity ot' water exposed to the directl heat ot the furnace is very readily converted into steam. For the boiler tohe effective this steam must be quickly liberated, and as it is still expanding on its ascent the upwardly-` enlarging tubes fully provide for-this. expansion, and thus the ascending saturated steam and heated water have ready access to the enlarged space above. Upon the top of each section is'cast the steam-dome G, which is pro# 'bodies are cylindrical or tubular in cross-sec tion; in fact, all the parts are cylindrical, and therefore embody the strength that round bodies are known to have as Acompared with rectangular bodies. The circulationk ot' the water is much easier and more rapid in conduits having circular turns at the angles than in those `having square ones, for the reason that in square corners there is sure to be an eddy which retards the circulation.

lt will be furtherobserved that my boilers enlarge in transverse section from the bottoni upward. Thus the flame has free access to impinge on all parts of the boiler before itescapes to the uptake, and the entire surface is exposed to the heat, and thus a rapid generation of steam is the result. The boiler maybe used for house-heating as well'as for steam' engine purposes.

Having described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. A steam-boiler section constructed with a lower small Water-space and upper enlarged water and steam space, said spaces having continuous connection at their ends, and a transverse connection through straight tapering tubes, all cast in one piece, said tubes enlarging in diameter from bottom to top, as de- Wages trally with kstraight tapering tubes enlarging upwardly from their base, a steam-dome connection, and a Water-connection, substantially as described.

In testimony that I claim the foregoing as myoWn I affix mysgnature in presence oftwo witnesses.

DAVID RENSHA W.

Witnesses EDWIN W. BROWN, WILLIAM S. BELLOWS. 

